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This réaction is restrained by a large excess of thiosulfate, and even more effectively by potassium iodide. A moderate excess of thiosulfate is commonly used, and an amount of potassium iodide

Figure 94. Mcrcury Fulminate Crystals for Use in Primer ComjKwition

Figure 94. Mcrcury Fulminate Crystals for Use in Primer ComjKwition

equal to 10 times the weight of the fulminate, and the titration for acidity (methyl orange indicator) is made as rapidly as possible. After that, the same solution is titrated with iodine (starch indicator) to determine the amount of unused thiosulfate and hence, by another method, the amount of actual fulminate in the sample. Speed is not essential in the second titration, for the iodine value docs not change greatly with time as does the alkalinity. Blank determinations ought to be made because of the

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